Ventilating device for sewing machines



Feb. 15, 1 944. BIEN 2,341,898 VENTILATING DEVICE FOR SEWING MACHINESFiled March 29, 1943 3.5 6 UL a 9 m 5 25 I r \1 8 5: 1 9

INVENTOR. j. BJ'EN 29 BY A- 7" TOR-IVE Y Patented Feb. 15, 1944VENTILATING DEVICE FOR SEWING MACHINES Israel Bien, San Francisco,Calif.

Application March 29, 1943, Serial No. 480,976

3 Claims.

This invention relates to a new and improved ventilating device for usein connection with sewing machines.

An object of the present invention is to provide a ventilating devicethat is especially constructed to be positioned onto the bed of a sewingmachine and directly connected to the drive shaft thereof and to thuscause the ventilating fan to be revolved in synchronism with theoperation of the sewing machine, thereby producing a cooling effect onthe bearing of the machine and also providing proper ventilation for theoperator.

Another object of the present invention is to provide novel means foradjusting the longitudinal center of the ventilating fans drive shaftwhereby the device can be operatively connected to various types ofsewing machines having different heighths and readily disconnected fromthe same.

Another object of the invention is to provide a meter operated by thefan shaft to record the number of stitches the sewing machine makes, byrecording the revolutions of the fan shaft which is in direct drivingrelation to the sewing machine shaft.

Other objects and advantages will appear in the course of the followingdescription.

In the accompanying drawing forming part of the specification and inwhich like numerals are employed to designate like parts throughout thesame:

Fig. l is a front elevational view of the improved sewing machineventilating device.

Fig. 2 is a central vertical longitudinal sectional view taken on line2-2 of Fig, 1, looking in direction of the arrows, and Fig. 3 is areduced side elevational view of the device and also shows the headportion of a sewing machine in dot and dash outline illustrating how theventilating fan shaft is positioned in alignment with the sewingmachines drive shaft and directly connected thereto.

Referring in detail to the different parts, the numeral 5 designates acylindrica1 casing that is preferably constructed with a pair ofcrossbars 6 forming a central bearing support as at I and is providedwith a removable wire guard 8 as shown in Figs. 1 and 2. A suitableventilating fan 9 is positioned within the casing and is secured to thedrive shaft ID as by pin 12 or otherwise, said shaft being journaledinto a suitable bearing l3 that is driven into the bearing support 1.The numeral l3 designates an oil hole for enabling the bearing to belubricated.

A collar I4 is mounted onto the outer end portion of the shaft l0 and isfixed thereto by a pin II.

The casing 5 is fixed at its lower edge onto the upper end of a pipecolumn l5 by preferably being welded thereto as at 16, the lower endportion of the pipe being externally threaded as at H to engage into aflanged foot l8 that is internally threaded as at IS, a set screw 20serving to lock the two members together. A plurality of holes 2| areprovided through the flanged portion of the foot to facilitate fasteningthe device to the bed or table 22 of the sewing machine by suitablescrews 23.

The inner end portion of the shaft I0 is flattened similar to a screwdriver as at 24, so that it will fit into the kerf or slot 25 of a screw25' provided at the outermost end of the sewing machines drive shaft 26,adjacent the drive pulley 29 thus directly connecting the two shaftstogether. When it is desired to disconnect the shafts the sewing machineis stopped with the kerf of its screw extending horizontally, the setscrew 20 is loosened and the casing 5 carrying the shaft I0 is swung ona horizontal plane to remove the flattened end of the shaft 24 from thekerf 25. The fan shaft can also be adjusted into true alignment with thesewing machines drive shaft by simply adjusting the foot member l8before securing to the table 22. Also it may be raised or loweredsomewhat by screwing or unscrewing the pipe 15 in the foot.

In Fig. 3 there is illustrated the preferred position of the ventilatorwith respect to the sewing machine. The numeral 25' designates thepulley retaining screw at the end of the drive shaft of the machine thatextends through the head 21 and operates the needle bar 28. The numeral29 designates the driving pulley that carries the conventiona] drivebelt 39. In various types of sewing machines this pulley is fixed to thedrive shaft by a screw as at 25 that extends into the end of the shaft,the head of the screw being tightened against the pulley. Though in rarecases where the slotted screw may not exist, the slot 25 can easily beprovided directly into the end of the drive shaft, or, the connection ofFig. 4 may be used, as will now be described.

Fig. 4 shows a modified form of detachably connecting the fan shaft 10to the sewing machine, and consists of providing a collar 38 slidablyfitted to shaft 10 and provided with a set screw 39 for holding it inadjusted position. A soft rubber extension 40 is cemented orothertremely hot causing excessive wear. The aver-- age conventionalsewing machine drive pulley 29 is constructed with a plurality of holesthat extend through the sides thereof and air from the ventilating fantraveling in direction of the ar rows 3! will be forced directly ontothe bearing that is provided into the head 27, serving to cool the sameand a portion of the same air coming from the fan will be divertedtoward the operator of the machine, thus also providing an efiicientmethod for producing proper ventilationin hot weather.

Means for recording the number of stitches made by the sewing machine,which is also the number of revolutions the fan makes, is shown ascomprising a bracket 32 extending from the end portion of the shaftbearing body l3 and carrying a conventional revolution recording meter33'secured to the bracket by screws 34.

The outerend portion of the meters shaft 35 is preferably flattened asat 36, and engages into a slot 31 provided into the outermost end of thefan shafts collar 35, thus keying the meter to the fan shaft in a mannersimilar to the construction employed for keying the fan shaft to thesewing machines shaft.

It is to be understood that the form of my invention herewith shown anddescribed is to be taken as a preferred example of the same and thatvarious changes relative to the material, size, shape and arrangement ofparts may be resorted to without departing from the spirit of theinvention or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. A ventilator for use in combination with a sewing machine, comprisinga pedestal, a ventilating fan revolubly supported thereon, said fanhaving a shaft with a flattened end for facilitating connection to thedrive shaft of the sewing machine, and adjustable means for varying theheight of the pedestal for facilitating alignment of said shafts.

2. A ventilator for use in combination with a sewing machine and adaptedto be operated by the drive shaft thereof, said ventilator comprising apedestal embodying in its construction a vertically disposed pipecolumn, a casing in the form of a'cylindrical shell fixed onto the upperend of said pipe column, a ventilating fan member including a shaftrevolubly supported in said casing, the fan shaft extending through saidcasing and having a flattened end adapted to project into theconventional transversely extending slot in the screw" at the end of thesewing machines drive shaft, and a foot member adjustably se-- cured tothe lower end portion of the pedestal whereby the height of the pedestalcan be varied, facilitating the'connecting and aligning of said shafts.

3. A ventilator for use in combination with a sewing machine, comprisinga pedestal, a ventilating fan revolvably supported thereon, said fanvhaving a shaft projecting in alignment with the sewing machine shaftadjacent the belt pulley thereof, the fan being directed toward thesewing machine shaft, and means forming a quick detachable directconnection from the fan shaft to the sewing machine shaft for operatingsaid fan, including means whereby said fan and its shaft may be bodilyswung on said pedestal on a vertical axis in disconnecting the shafts.

ISRAEL BIEN.

